According to Bloomberg, one of Apple's senior engineers raised concerns a year ago over the potential for the iPhone 4's design to cause dropped calls.

Ruben Caballero, an antenna expert at Apple who worked on the device, spoke with management last year about his belief that the iPhone 4's design could cause reception troubles, according to Bloomberg sources. A "carrier partner" also expressed worries over potential antenna issues. All of which backs up what qualified third parties have said since the iPhone 4 "death grip" was first discovered. Apple has declined to comment, but will hold an iPhone 4-related press conference tomorrow.

Apparently Apple has invited a handful of folks to a very special press conference scheduled for…
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This is the first indication that people internally at Apple knew about the phone's potential problems before its June release. Until this point, the only official acknowledgment from the company has been a recent software fix that thus far seems to have been ineffective.